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Discussion Starter · #41 · (Edited)
Pattern Testing Update (Backdating to June 28)​

I have still not finished compiling the data, but I figured I would share what I have since the end of the pattern testing since some may be interested in it; I will repost this without the preface when the pattern data table is complete...

Load Data for pattern tests:
DEVASTAOR - 2oz Bismuth
Hull: 3-1/2" Cheddite 10ga Mag (once fired and resized - Boss shot loaded in Red, Roto shot loaded in Green)
Primer: Rio #209
Powder: Vhit. 3N38 - 41.5gr*** NOTE: No improvement in velocities, some pressure signs on primers in test conditions of 80 plus degrees F, 41gr Remains MAX and safe
Wad: BPI Multi Metal 10 + .25" Foam cushion wad + 5cc Precision Reloading Spherical Buffer
Shot: 2oz of #2 Bismuth (Boss and Rotometals tested)
Average Velocity: Approx. 1,275 FPS (averages taken for 28" to 32" barrels, extended (not ported) chokes did see increased velocities, 4 out of 30 shots excluded for 'ERROR' or extreme spreads low/high not considered accurate or consistent with majority of recorded data set. Caldwell Ballistic Chronograph utilized 3' from muzzle)


- Method -

Identical 2oz loads were created between two Bismuth shots created by different manufacturers; Boss Shotshells and Rotometals. Loads differed only in hull color for ease of identification. Both the Boss Shotshells bismuth shot and Rotometals bismuth shot were packaged and sold as #2 sized shot (.150"). Pellet sizes and weights were sampled and averaged in a random selection of 10 pellets per shot type. The Boss shot came in at an approximate per pellet average of 0.1490" diameter and a weight of 4.510gr (97 pellets per ounce), while the Rotometals bismuth shot averaged 0.1450" diameter and a weight of 4.177gr (105 pellets per ounce). The Boss bismuth is 94% Bis./6% Tin alloy and copper plated. The Rotometals bismuth is 94% Bis./6% Tin alloy with no coating or plating.

Loads were tested in the same or relatively similar conditions in a two session span:

Mid to late afternoon, clear skies. 80-85 degrees F., 60-80% humidity, Pressure of 29-30 inHg, Elevation of approx 1,700 FASL, wind 0 to 6 MPH from front at 0 degrees.

Three different firearms were used;
- Ithaca Mag-10 (Standard Grade) 32" Barrel choked "Full" (.725" constriction)
- Ithaca Mag-10 Deluxe 28" Barrel (customized with Briley Man. Series-16B(VX) chokes, chokes extended 1-1/8" past muzzle)
- Browning Gold 10 Field (aluminum receiver) 28" Barrel.

The following chokes were used in each firearm;

- Ithaca Mag-10 (Standard Grade) 32" Barrel - FIXED "Full" (.725" constriction)
- Ithaca Mag-10 Deluxe 28" Barrel (Briley Series-16B(VX) ) - .745" "Light Full" Constriction, .735" "Extra Full" Constriction
- Browning Gold 10 Field (aluminum receiver) 28" Barrel - Carlson's Chokes .750" Improved Modified Ported Choke, SRM/WadWizzard .720" Terror Tube

Pattern samples were made with the prior equipment at 40, 50, and 60 yards distance measured and verified with a Leupold RX-1600i TBR Laser Range Finder. Distances to target are from the muzzle. One shot per shot type, choke, firearm and distance were taken. Velocities were recorded per firearm and equipped choke. Patterns are evaluated within a 30" circle from the intersecting pattern core. Pattern core determined by evaluating the fringe pellets and tracing a line to the farthest pellet across from it in the pattern. The concentrated intersections of at least 5 plots are considered the pattern core/center. From the determined core/center, the 30" circle is plotted and pellet strikes counted within. Percentages are derived from the total in the 30" circle divided by the known number of pellets in each load per shot type.

Results are recorded as follows:


Gun/Choke​
Pellet​
% of Shot in 30" Circle at 40 Yards​
% of Shot in 30" Circle at 50 Yards​
% of Shot in 30" Circle at 60 Yards​
G10/.750 IMBOSS
67%​
G10/.750 IMRoto
56.19%​
G10/.720 TTBOSS
82.98%​
G10/.720 TTRoto
52.4%​
M10 - .725" FBOSS
62.9%​
M10 - .725" FRoto
68.1%​
M10 Deluxe/.745" LFBOSS
90% (+/- 1%)​
65.71%​
M10 Deluxe/.745" LFRoto
90% (+/- 1%)​
64.3%​
M10 Deluxe/.735" XFBOSS
98.45%​
73.7%​
M10 Deluxe/.735" XFRoto
89.5%​
72.86%​
 

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Thank you for your reply about PT1044 wad. I think that this is now a discontinued product. As Rem SP10 is currently out of production I guess that there are no cushion wads available to the home loader.
 

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Discussion Starter · #44 ·
Thank you for your reply about PT1044 wad. I think that this is now a discontinued product. As Rem SP10 is currently out of production I guess that there are no cushion wads available to the home loader.
I would not say they are discontinued. They show up each spring on BPI’s website and others. They are produced inannual batches is my guess and we only see one shot at them. With BOSS using them and the popularityof hand loading for 10ga owners it doesn’t surprise me that we have had trouble getting them this year. They showed up on BPI’s site in April this year and were around for several weeks before going out of stock.

best bet is to give BPI a call and see if they can let you know when they expect the next batch.
 

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Discussion Starter · #45 ·
- Pattern Testing of "Devastator" Load -
(FINAL DATA)​

Load Data:

"DEVASTAOR" - 2oz Bismuth
Hull: 3-1/2" Cheddite 10ga Mag (once fired and resized - Boss shot loaded in Red, Roto shot loaded in Green)
Primer: Rio #209
Powder: Vhit. 3N38 - 41.5gr*** NOTE: No improvement in velocities, some pressure signs on primers in test conditions of 80 plus degrees F, 41gr Remains MAX and safe
Wad: BPI Multi Metal 10 + .25" Foam cushion wad + 5cc Precision Reloading Spherical Buffer
Shot: 2oz of #2 Bismuth (Boss and Rotometals tested)
Average Velocity: Approx. 1,275 FPS (averages taken for 28" to 32" barrels, extended (not ported) chokes did see increased velocities, 4 out of 30 shots excluded for 'ERROR' or extreme spreads low/high not considered accurate or consistent with majority of recorded data set. Caldwell Ballistic Chronograph utilized 3' from muzzle)


- Method -

Identical 2oz loads were created between two Bismuth shots created by different manufacturers; Boss Shotshells and Rotometals. Loads differed only in hull color for ease of identification. Both the Boss Shotshells bismuth shot and Rotometals bismuth shot were packaged and sold as #2 sized shot (.150"). Pellet sizes and weights were sampled and averaged in a random selection of 10 pellets per shot type. The Boss shot came in at an approximate per pellet average of 0.1490" diameter and a weight of 4.510gr (97 pellets per ounce), while the Rotometals bismuth shot averaged 0.1450" diameter and a weight of 4.177gr (105 pellets per ounce). The Boss bismuth is 94% Bis./6% Tin alloy and copper plated. The Rotometals bismuth is 94% Bis./6% Tin alloy with no coating or plating.

Loads were tested in the same or relatively similar conditions in a two session span:

Mid to late afternoon, clear skies. 80-85 degrees F., 60-80% humidity, Pressure of 29-30 inHg, Elevation of approx 1,700 FASL, wind 0 to 6 MPH from front at 0 degrees.

Three different firearms were used;
- Ithaca Mag-10 (Standard Grade) 32" Barrel choked "Full" (.725" constriction)
- Ithaca Mag-10 Deluxe 28" Barrel (customized with Briley Man. Series-16B(VX) chokes, chokes extended 1-1/8" past muzzle)
- Browning Gold 10 Field (aluminum receiver) 28" Barrel.

The following chokes were used in each firearm;

- Ithaca Mag-10 (Standard Grade) 32" Barrel - FIXED "Full" (.725" constriction)
- Ithaca Mag-10 Deluxe 28" Barrel (Briley Series-16B(VX) ) - .745" "Light Full" Constriction, .735" "Extra Full" Constriction
- Browning Gold 10 Field (aluminum receiver) 28" Barrel - Carlson's Chokes .750" Improved Modified Ported Choke, SRM/WadWizzard .720" Terror Tube

Pattern samples were made with the prior equipment at 40, 50, and 60 yards distance measured and verified with a Leupold RX-1600i TBR Laser Range Finder. Distances to target were verified from the muzzle. Pattern samples were taken at one shot per shot type, choke, firearm and distance were taken. Shots were fired off-hand, and Point of Aim versus Point of Impact descrepancies were not considered or controlled for in this test. Velocities were recorded per firearm and equipped choke to provide for an overall average. Patterns are evaluated within a 30" circle from the intersecting pattern core. Pattern core was determined by evaluating the fringe pellets and tracing a line to the farthest pellet across from it in the pattern; the concentrated intersections of at least 5 plots are considered the pattern core/center. From the determined core/center, the 30" circle is plotted and pellet strikes counted within. Percentages are derived from the total in the 30" circle divided by the known number of pellets in each load per shot type.

Results of pattern testing are recorded in the chart below.
- Conclusion -

In consideration of all firearm, choke, and distance to target variables the Boss shot exhibited an overall average of 5.380% greater pattern efficiency in a 30" circle over the Rotometals shot. At 40 yards, the difference favoring Boss was an average of 7.978%, at 50 yards 4.565%, and at 60 yards 3.598%.

As both #2 bismuth shot types were loaded to the same standards, it is assumed that the marked variances in pattern efficiencies are due to the factors and variances of each shot type. Both are assumed to be the same hardness with manufacturer claims stating 94% Bismuth/6% Tin alloy, and thus the primary differences are to be noted in plating and diameter/weight averages.

Although the Rotometals shot had a higher overall pellet count per shot charge due to its smaller average diameter and lower weight, the increase of 16 pellets per charge did not correlate to increased numbers of hits or percentages within the 30" pattern evaluation. Notably, Boss shot trended to retained equal or higher numbers of strikes within the 30" evaluation circle at each distance, which with the lower overall pellet count did increase its pattern percentage and statistical efficiency, but numerically was relatively equal. Ballistically, the Boss shot is superior even with its increased diameter over the Rotometals shot, as the higher weight translates to greater energy downrange at a less than 8% difference in pellet count per 2 ounce shot charge. The addition of the copper plating of the Boss shot is assumed to increase aerodynamic efficiency over the bare Rotometals shot and is a tertiary factor contributing to the results of the pattern tests. Calculations on retained energy and correlation to lethality on different sized birds outlines that the Boss shot is the superior choice in the implementation of this load for extended range shooting. However, the ballistic differences between the two shot types in this load are not significant enough at ranges of 50 yards and less to make any truly notable difference on live game. Pattern densities within 10% or less of each other per gun/choke/distance, even pellet distribution, and retained energies within 6% of each other at such distances indicate there will be no perceived difference by a hunter. Only at the outer limits of pass shooting (55 to 65 yards) should the smaller statistical differences be considered as being enough marked improvement to correlate to the justification of the Boss shot over the Rotometals shot and making it a more ethical choice for such tasks in its increased lethality potential.

Efficacy of the two shots is viable for birds of small duck to small goose size from 65 yards and closer, and the loads when paired with the correct choking are capable of use for turkey at ranges of 50 yards and less. The retained energy calculated with a mean start velocity 3 feet from the muzzle of 1,275 FPS ensures that with a minimum of 3 to 5 strikes on small to medium geese in the vital zone, and a minimum of 1 to 3 strikes on ducks, that birds can be downed and or cleanly dispatched to a distance of 65 yards. It is my personal recommendation that shots be limited to 60 yards and less to ensure that lethality is maintained and provide for margin of error when judging distances on birds. For larger geese such as Greater Canada's, a reduction of an additional 5 yards in range with a minimum number of strikes remaining the same is to be considered. To increase lethality of the load on large geese past 55 yards, it is recommended that the shot size be increased to #1 (.160") or #B (.170") should acceptable roundness and consistency of the larger bismuth shot be sourced.


- PATTERN RESULTS-
* = Potential error or failure of load; does not meet trend of data

Gun/ChokePellet% of Shot in 30" Circle at 40 Yards% of Shot in 30" Circle at 50 Yards% of Shot in 30" Circle at 60 Yards
G10/.750 IMBOSS
92.7%​
67%​
50.51%​
G10/.750 IMRoto
82.86%​
56.19%​
48.1%​
G10/.720 TTBOSS
97.9%​
82.98%​
52.06%​
G10/.720 TTRoto
88.57%​
*52.4%​
54.28%​
M10 - .725" FBOSS
92.26%​
68.1​
40.95%​
M10 - .725" FRoto
82.85%​
62.9%​
40.47%​
M10 Deluxe/.745" LFBOSS
92.78%​
65.71%​
51.54%​
M10 Deluxe/.745" LFRoto
91.42%​
64.3%​
42.85%​
M10 Deluxe/.735" XFBOSS
98.45%​
73.7%​
57.2%​
M10 Deluxe/.735" XFRoto
89.5%​
72.86%​
48.57%​
 
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Came across this if you’re looking:

10gauge Fed with Paper base wad
2oz Bismuth
Longshot 33.5gn
Win 209
Rem. SP10
32.5gn/10,000 PSI
33.5 gr/10,800 PSI
1225-1250fps
Doc,
is this load buffered?
would powder migration be a possible issue in this instance - Longshot/SP10/straight walled hull ?
 

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Doc,
is this load buffered?
would powder migration be a possible issue in this instance - Longshot/SP10/straight walled hull ?
From what I have, it’s not buffered, and powder migration is possible, but if it’s a concern, a nitro card or fiber wad seal can help.

I have never loaded it, just had the data saved from on old reloading manual.
 

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Discussion Starter · #49 ·
Doc,
is this load buffered?
would powder migration be a possible issue in this instance - Longshot/SP10/straight walled hull ?
Like Doc said, powder leak is possible. It all depends on wad base to hull fit. In my experience, the SP-10 wad fits fairly well in the Fed hulls, but there are always variances lot to lot. Longshot flows fairly well, so a loose fit will probably have some leak around the gas seal of the wad, but if you are firmly seating your wads when loading it won’t be enough of a problem to cause a problem.

You can add buffer to that load as well, but you may top out at a slightly lower powder charge, just depends on your buff charge.
 
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