God, Family, Community, WATERFOWL HUNTING
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:
% of Shot in 30" Circle at 40 Yards
% of Shot in 30" Circle at 50 Yards
% of Shot in 30" Circle at 60 Yards
|M10 - .725" F||BOSS|
|M10 - .725" F||Roto|
|M10 Deluxe/.745" LF||BOSS|
90% (+/- 1%)
|M10 Deluxe/.745" LF||Roto|
90% (+/- 1%)
|M10 Deluxe/.735" XF||BOSS|
|M10 Deluxe/.735" XF||Roto|