I had a friend contact me today. He does not have a computer. He IS an ASSRA member.

He is building a 7mm (.284 bore diameter) rifle. He will be breech seating. His barrel has a 1/11" twist. He needs a competive cast bullet mould for 200 yard use.

Barry, are you listening?

I am open to suggestions as to mould maker. My friend does not want to wait a year for a mould. He wishes to be ready to go as soon as a slightly warmer day is at hand (it was zero here this morning). I am afraid that he is a bit like me. We are so old that we don't even buy green bananas

Any suggestions will be appreciated.

Dale53

Barry:  How much of that 30% difference in wind drift would be due to the weight difference.
mes

Dale,

I second getting a Steve Brooks mold, am happy with the one I got from him late summer just under 3 weeks. Am also happy with my Hoch mold, he delivered within his projected time frame which was 12 to 16 weeks. Don't mind the turn around time if he says up front. Still waiting for my swage dies. He now says will be done the end of the month, that will be 11 months on a 4 month promise date. Another maker said 6 months and almost 6 monyhs to the day I got a letter saying he wasn't making molds anymore.
Any body want the names i will pass them on.

Damn Dale it's too cold in the shop!

Ed

Could you tell me just what 7mm case this is?
                                     Thanks B.A.

mes,

I have compared the actual velocity loses of many styles of bullets at 100 and 200 yards, to best answer your question I will let you compare the 200 yd velocities of some various weight and nose form 32 cal bullets. The following tests was the averages of 30 shots for each bullet style.

For this comparison the load was adjusted to stabilize the longest bullet and to acheive same muzzle velocity for each bullet (1557 approx.) of 5 tested in a 1 in 16 twist 32 caliber barrel.
WD (Wind deflection) inches = 10mph 90degree crosswind

1.-188.5 grn factory style flatnose:
Muzzle vel=1564fs    200yd vel=1188fs    WD= 11.10"

2.-191.0 grn tapered Pope style nose:
Muzzle vel=1557fs    200yd vel=1175fs     WD= 12.40"

3.-189.0 grn 6cal ogive spitzer nose:
Muzzle vel=1563fs    200yd vel=1237fs      WD= 9.25"

4.-209.0 grn 5cal ogive spitzer nose:
Muzzle vel=1558fs    200yd vel=1225fs      WD= 9.60"

5.-214.5 grn 5cal ogive spitzer nose:
Muzzle vel=1559fs    200yd vel=1238fs       WD= 9.14"

Chronograph = Oehler43PBL  Skyscreen III's at muzzle and 200yds. 



If you compare the velocities of bullet test #3 and #5 both had similar MV's  and almost the same 200yd velocities, the slightly more streamlined 189 grn spitzer has the same 200yd velocity as the 25grn heavier slightly less streamlined spitzer. These tests were done on the same day with fairly constant temperature and barometric pressure. So I suppose the answer to your question is, a 30% reduction in wind deflection depends on the effeciency of the bullet design to which you would add the weight. I hope you find my explaination clear.

Regards,
Barry

Thanks good people. I will see that my friend gets this information as soon as possible.

It is also quite interesting to me!

Dale53

Waterman;
Thank you for your interest. I'll pass that information along.

Dale53

Long Rifle;
I just saw this this A.M. I have left a message for my friend. If he is interested, I'll have him call you.

You might write me direct at:

rmcgee6@cinci.rr.com

and give me your telephone and U.S. Post Office information and I will have him call you if he is interested. He does not have a computer.

Dale53