Duplicated UW 45 Super

[Alaska]

Duplicating the Underwood 255gr in 45 Super

8.2 of Longshot
250gr Rim Rock RNFP Top Shelf
WLP Primers
Starline 45 Super Brass
1.220”
Lee Factory Crimp
1075 FPS

5.2” KKM and 24 pound Spring
G21 Gen 4

 

[Guy Miner]

Thanks for that report. Am very interested in the 45+P and 45 Super.

Guy

 

[Alaska]

Thanks for that report. Am very interested in the 45+P and 45 Super.

Guy

Going into my 3rd year with 45 Super in G21.
using my G21 more than G20 in Bear Country of Alaska.
The 3 powders I have used so far are Power Pistol / Longshot and AA9.
I have a Rowland Comp that I used in testing only with 45 Super + P loads. Easy with those 3 powders . Prefer No Comp
Enforcer Powder is one I would like to try also with CCI 350.
My best loads so far has been with Longshot and the 250gr Rim Rock TS RNFP. I noticed in KKM barrels the regular WW and Starline 45 ACP brass performed excellent at 45 Super + P levels.
I prefer WLP primers for 45 Super and 1.220” with Longshot. Same as UW.
My 45 Super load is 8.2 of LS with this bullet which is 1075 fps in 5.2” KKM . I don’t need more velocity for Bear Protection that’s plenty.

I have some Starline 45 Super Brass on hand but after testing with regular 45 ACP I see no need for it in KKM barrel. .481” is Max case expansion don’t go past that on brass. Using my KKM barrels I have not even come close to .481” with velocities closer to Rowland than Super.

Power Pistol @ 8.6 (Fed 150)
Longshot @ 8.2 (WLP) Favorite
AA9 @ 12.6 (CCI 350)
5.2” KKM 1075 FPS No Comp

Done some testing with 45 ACP Fed Nickle Small Primer Pocket using CCI Small Pistol Mag primers excellent results very nice primer results with PP and LS very similar to 450 SMC using Missouri 255gr Keith .

Duplicated BB load with 255gr Hardcast 45 ACP+ P
AA9 @ 12.0
CCI 350
250 Rim Rock TS RNFP
1.190” same as BB
45 ACP Starline Brass
990 to 1000fps in 5.2” KKM
BB factory load is 958 FPS in 4.6”’
11.8 of AA9 should land you dead center on BB load and BB 255gr Hardcast bullet is closer to 250gr in weight than 255gr. Possibly the same Rim Rock bullet that I use !

Tamper Crimp all .471” with Lee Factory Crimp Die.