The one factor that has not been mentioned is barrel length. So often we read articles on wildcats as in PO Ackley's book and there is no mention of the length. Same goes for twist.
I am in the process of putting together a 30" 7 Rem mag and would like to hear what velocities can be expected with a 180. 1 in 7 twist, which should slow things down a bit.
For what it is worth. My friend is making a 30" 1 in 7 twist, 7 STW to shoot the 180 Berger VLD.
In his conversation with Dave Kiff barrel life was discussed. Dave, apparently is a lover of this chambering. He said it took several burned out barrels to realize he could extend the life by keeping the bullet into the rifling instead of any kind of jump. My friend's rifle mag has enough room after a wyatts mag box to be able to chase the rifling. My action is a mauser style and too cost prohibitive or perhaps impossible to lengthen the mag box for the STW or I would have made one too. The 7 Rem Mag fits well and I can chase the rifling for the life of the barrel.
Can anyone out there give us a clue on velocity with the 180 VLD and the 7 Rem Mag?
Perhaps we have missed the boat. The 284 is capable of 3000 fps with a 180 using RL-17!!!
Alliant Reloder 17
Rifle #1: .284 Winchester with Berger 180s
.284 Winchester Prone Rifle built up by Warner Tool Co. with Masterclass Stock, Barnard Action, Broughton 1:9" twist 5C barrel (31.5" long).
All loads used neck-turned, Winchester-headstamp .284 brass, CCI BR-2 primers, and naked (non-moly) Berger 180gr VLD bullets seated .010" in the lands:
51 gr RL 17 - Mean Velocity 2881 fps, ES 17, SD 7 - No pressure issues at all
52 gr RL 17 - Mean Velocity 2953 fps, ES 19, SD 7 - No pressure issues at all
53 gr RL 17 - Mean Velocity 3003 fps, ES 25, SD 10 (Slight sticky bolt lift on 3 rounds - this is about top end for my liking but I would not hesitate to shoot it however if it turns out to deliver good accuracy).
Big Speed Gain with Reloder 17 in .284 Win
RL 17 clearly enables me to run the Berger 180s easily 125-150 fps faster that I normally was able to shoot them with H4350 and H4831SC in this rifle. My previous load ran around 2825 - 2850 fps with the Berger 180s and that was about all I could get out of it.
I wonder if RL-17 would work in the 7 Rem mag and 7 WSM?
Sorry not meaning to hijack your thread, I feel these topics are related.