In this issue:

Re: New barrel & Loads for Walther GSP 32???
Re: Loads for Walther GSP 32???
Re: Air rifle ballistics

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<< Sure would like to know what other shooters are loading for the
 Walthr GSP 32. >>
Speaking of such things... An article appeared in the American Rifleman 
several years ago (8-12?) which described an after market barrel for the .32 
GSP with a different twist. The new barrel was supposed to provide such an 
increase in bullet stability that the gun was now useful at 50 yards. 
Something which was definitely not true in the past... Does anyone know if 
this twist change was adopted by Walther or if the barrels are still 
available? If I am not mistaken, there was also a discussion of loads for 
this pistol.
Best regards,
Phil Williams

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Regarding 32 Target loads for Walther GSP 32. I use Lapua cases, Winchester
primers, Bullzi 98gr hollow base wad cutters (This is an Australian product
so I guess you'll have to find a substitute outside Aus & NZ) and 1.6gr
W231 powder. Works like a charm in my GSP, I have used this load for
several years and I've shot several 295+/300 with it.  One point though, I
like to use this faster burning powder becuase I think it helps expand the
skirt of the follow base wad cutter to fill the rifling more fully.

Good luck

Francis

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Since I just joined your mailing list recently, I might have missed some 
correspondence, but anyway: here's a response to a question from the archives 
(Issue3, Vol.7):  

> If you have any information on the ballistics of air rifle
> shooting, we were wondering if you could send the information to
> us by replying to this e-mail. 

You can do ballistic calculations with the computer programme PCB (freeware, 
found at http://www.stud.unit.no/~oddske/ballistics.html). I have found it
to work 
OK for air rifle calculations,

What you will need is the pellet's muzzle velocity (V0) and Ballistic
Coefficient 
(BC). The source I use for BC values is an article in the German magazine 
Visier: (1995, Vol. 10, pp. 42-48). E.g.: for RWS R10 diabolos, BC=0.011.

The thing I like most about PCB is that you can calculate the effect of cant 
angle error on the point of impact. How many degrees cant angle variation 
before you will hit the 9 instead of the 10 ...? And where does the point of 
impact shift to ? It seems that most competitors know you should maintain a 
fixed cant angle, but very few know about the qualitative or qualitative
effect of 
cant error on the point of impact.

Finally: great mailing list!

Regards
Jeroen Hogema
Air Rifle 
The Netherlands

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End of UIT Mailing List #31

Michael Ray - Systems Engineer
Rose-Hulman Inst. of Tech. Rifle Coach
UIT Shooting Page - http://www.geocities.com/Colosseum/1190/index.htm



Michael Ray - Systems Engineer
Rose-Hulman Inst. of Tech. Rifle Coach
UIT Shooting Page - http://www.geocities.com/Colosseum/1190/index.htm