Recent content by groper

The problem with driving bands is they create more drag... They do good things for velocity just as you say, however 100fps lower velocity is much less of a penalty than a ~20% increase in drag... something else for you to think about... :cool: Want proof? buy bryan litz`s second edition book...

the problem in 30cal is the std twist rate barrel being limited 1:10, if you have a tighter twist rate barrel then you can design a copper bullet with a higher BC than existing lead bullets such as the 240gr SMK. To get the same SD in copper the bullet has to be longer and requires more rpm to...

Still waiting for bill to get back to me on the 338's ...

Topshot, short answer- in Your .338cal, try the lapua 250gr lockbase. Long answer- projectiles with relatively short length and shallow angle boat tails or no boat tail at all have better stability throughout their flight, particularly transonic. Finer meplat dia helps also as does a better...

Yes I do believe it would help topshot, this bullet has good form except for it's meplat- it's too big and ruins the aerodynamics with excessive detached bow shock. The ideal meplat size for this bullet would be around 35 thou if it could be achieved...

a shooter using a custom 7mm RSAUM just won the australian F class open long range titles using 180gr bergers @ 2970fps. Almost the same ballistic performance as a 7mmWSM with 7% less powder and less recoil = better efficiency. - i have decided this will be the chambering of my switch barrel...

Barnard, NZ - also comes with their excellent match trigger included, no safety tho. Stiller, US Lawton, US BAT, US These are are the main players, but there maybe others such as EDM etc but im not sure if they will sell just an action. They are all priced about the same, you can check their...

a yard is a yard a meter is a meter your conversions are accurate, so whats the question? People do not interchange yards with meters as if they were the same, its just that there are people on this forum from all around the world, some use meters some use yards, thats all... Soundwaves, you...

Then when you have your rifle, give me a call for some 375cal 375grain projectiles similar to these ones, they work brilliant from a 1:10 twist barrel and you should be able to push them @ ~2900fps from a tejas/RUM improved...

I feel your frustration... i experienced the same thing from time to time on my model 10FCP. For me, it would happen only very rarely which is why it was difficult to figure out the cause of the problem... for my wife, it would happen just about every single time she tried to pull the trigger...

No, FTE is brilliant - i use it myself... FTE doesnt know how to average the BC, you have to give it the averaged BC in the input. No ballistic calculator can average the BC automatically as it does not have all the information it needs in order to be able to do this. Different shape bullets...

All manufacturers quote G1 BCs for their bullets, only some quote G7 in addition like berger for example. So, G1 is almost always the "native" BC in ballistic FTE... that said, the reason you never get a trajectory to work with published G1 BC`s, is because they always invariably publish the G1...

Its not necessarily untrue/incorrect, its more because you need the "cumulative average BC" in your ballistics calculator rather than the muzzle velocity G1 BC... so many people still fail to realize the difference...

Lesson #1 - chronies lie, groups dont... Second point is - im not sure what your doing with your ballistic calculator, but my calculator is telling me that a 25fps velocity spread = 2.3in vertical POI shift @ 750yds, not 6inches...? Lastly, have you tried a different primer? the fed 215 is the...

Augustus, the "average cumulative BC" is what your are measuring and is whats important, not the muzzle velocity BC - which dont mean a **** to us... As far as i know, dave veirs is the only person in teh world who has shot the GS 414 and he has only shot it 1100yds or so... no average BC for...