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Old 08-28-2004, 13:53   #12
G-20er
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Join Date: Aug 2004
Location: California
Posts: 117
Learned something very interesting today while using LongShot Powder. For starters it doesn't even come close to Mikes DoubleTap 200gr. XTP loads. See other post for details.

Also I learned that I can actually get the same velocity out of 8.2 grains as I can get out of 9 grains. Note: 9 grains is not worth the extra pressure. Check out 8.5 grains...the velocity actually is lower than the 8.2 grain load. What the heck over? Keep an eye on the ES also. Looks like I'll keep the 8.2 grain load. I tested it twice because I couldn't believe that the 8.5 was actually slower than the 8.2

G-20 with standard length KKM barrel and 22 pound recoil spring with tungsten guide rod. All bullets fired were 200 grain XTP with a OAL of 1.270. New Starline brass and CCI 350 Mag primers. Note: all brass still flew 10-12 feet to the right. Wish I would have ordered the 24 pound spring.

8.2 grains:

GROUP #3
1) 1185.0 14.8
2) 1167.0 -3.2
3) 1192.0 21.8
4) 1142.0 -28.2
5) 1179.0 8.8
6) 1171.0 0.8
7) 1160.0 -10.2
8) 1166.0 -4.2
9) 1171.0 0.8
High: 1192.0
Low: 1142.0
E.S.: 50.0
Ave.: 1170.2
S.D.: 14.4
95%: 12.0





8.5 grains:

GROUP #14
1) 1121.0 -22.0
2) 1138.0 -5.0
3) 1174.0 31.0
4) 1178.0 35.0
5) 1138.0 -5.0
6) 1145.0 2.0
7) 1151.0 8.0
8) 1118.0 -25.0
9) 1160.0 17.0
10) 1107.0 -36.0
High: 1178.0
Low: 1107.0
E.S.: 71.0
Ave.: 1143.0
S.D.: 23.4
95%: 19.0





9 grains:

GROUP #7
1) 1183.0 5.6
2) 1156.0 -21.4
3) 1194.0 16.6
4) 1172.0 -5.4
5) 1182.0 4.6
High: 1194.0
Low: 1156.0
E.S.: 38.0
Ave.: 1177.4
S.D.: 14.2
95%: 18.0



Listed below is further information at 8.5 grains of LongShot. The only thing that I changed was the OAL of loaded rounds.

8.5 with OAL of 1.25:

GROUP #12
1) 1117.0 -7.4
2) 1077.0 -47.4
3) 1146.0 21.6
4) 1142.0 17.6
5) 1154.0 29.6
6) 1104.0 -20.4
7) 1132.0 7.6
8) 1123.0 -1.4
9) 1136.0 11.6
10) 1114.0 -10.4
High: 1154.0
Low: 1077.0
E.S.: 77.0
Ave.: 1124.4
S.D.: 22.6
95%: 18.0




8.5 with OAL of 1.26:

GROUP #13
1) 1170.0 23.8
2) 1132.0 -14.2
3) 1166.0 19.8
4) 1145.0 -1.2
5) 1140.0 -6.2
6) 1151.0 4.8
7) 1130.0 -16.2
8) 1115.0 -31.2
9) 1161.0 14.8
10) 1152.0 5.8
High: 1170.0
Low: 1115.0
E.S.: 55.0
Ave.: 1146.2
S.D.: 17.2
95%: 14.0



8.5 with OAL of 1.270:

GROUP #14
1) 1121.0 -22.0
2) 1138.0 -5.0
3) 1174.0 31.0
4) 1178.0 35.0
5) 1138.0 -5.0
6) 1145.0 2.0
7) 1151.0 8.0
8) 1118.0 -25.0
9) 1160.0 17.0
10) 1107.0 -36.0
High: 1178.0
Low: 1107.0
E.S.: 71.0
Ave.: 1143.0
S.D.: 23.4
95%: 19.0


By looking at the E.S. this load prefers the 1.260 length.




Below is at 9 grains with slight change in OAL:


9 gr. with OAL of 1.270:

GROUP #7
1) 1183.0 5.6
2) 1156.0 -21.4
3) 1194.0 16.6
4) 1172.0 -5.4
5) 1182.0 4.6
High: 1194.0
Low: 1156.0
E.S.: 38.0
Ave.: 1177.4
S.D.: 14.2
95%: 18.0



9gr. with OAL of 1.260:

GROUP #8
1) 1169.0 -3.6
2) 1121.0 -51.6
3) 1187.0 14.4
4) 1210.0 37.4
5) 1176.0 3.4
High: 1210.0
Low: 1121.0
E.S.: 89.0
Ave.: 1172.6
S.D.: 32.6
95%: 41.0


As you can see the E.S. got worse with this load as the bullet was seated closer to top of powder charge. Do not recommend this load due to no real advantage in velocity over the 8.2 grain load.

Last edited by G-20er; 08-29-2004 at 09:47..
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