6.5X47MM LAPUA IMPROVED... Need info...

[280man]

I know guys that are getting this speed out of .284 WIN with outstanding accuracy take the easy path and don't reinvent the wheel just my $0.02 worth

 

[ConnorExum]

I know guys that are getting this speed out of .284 WIN with outstanding accuracy take the easy path and don't reinvent the wheel just my $0.02 worth

well that might be the option, perhaps a 284win Improved...

I'm a philosopher; we love to reinvent the wheel, because that's what we do best. We argue the same problems over and over again reinventing the wheel and telling the other guy his wheel is defective because of reasons X and Y...

If that works that well I'll have to look into it. I thought the 284win was pretty taxed out at 2800fps with 168grain VLD's. But if if it is not then I will have to look into it. I'm worried about the recoil effect in a prone rifle, I would like a lighter recoiling rifle but hey I also like the idea of having only 55 inches of wind-deflection at 1000yards too... So I'm sort of screwed on the boat... If I push the 6.5mm to breaking point I'll get similar recoil as that of a 7mm pushed below the breaking point with the same amount of wind deflection. I might just have to bite the bullet and accept the extra recoil of the 7mm for better long range performance.

 

[ConnorExum]

How about a 404 Jef cut down to 47mm with no body taper and 40deree shoulder... What sort of powder capacity would that give us? It appears we need about 50grains to get the velocity I want and not 41-42grains.

Sounds like a 7mm Dakoa improved if you ask me. there gets to be a point of diminishing returns, and I think we we are getting close.

SDH

Yeah a 404jeffery cut down 47mm would be similar to 7mm Dakota Mag, the 7mm WSM and even the 7mm Ultra Magnum. However, the Pegasus cartridge would be different breed, I was hoping to get about 60-65grains of capacity a 100% load density for 168grain bullet... I wanted a nice wide short column of powder that hopefully burn more efficiently giving me maximum velocities at 60-62k Psi but who knows if it would. it is all just conjecture and since I'm still in College I really don't have the cash to play around find out.

 

[k6ctw]

You pose an interesting possibility, that of necking the 6.5x47L up to 7mm. It would appear from the other posts that this might just prove to be a real bonus performer at the 1000yd line. However, the bad news is that you will have to put up with a bit more recoil to get that little edge.

My own opinion is that if you have less recoil then you get better performance out of the shooter! That increased shooter performance, in my opinion, is worth a lot more than a few inches of wind drift at 1000 yds. That is one of the reasons that I built the 6.5x47L,gun of the week 85) that I did. I also did not "push" it real hard with the Berger 130 gr VLDs because I want to get a bit more barrel life. This ended up giving me excellent performance,right in the ball park with the barn burners) with minimum recoil.

Prior to building the rifle I was shooting a 308,any/any) and occasionally a 30/06,any/iron) with the 200 gr SMK at 2610 fps. I found that with the 30/06, my first 20 shot match was usually just fine but during the 2nd one on the same day I would be tired from the pounding and thus my 2nd match performance,read scores) usually suffered. When I shot 3 matches in a day, the performance continued to go down.

With the 6.5x47L I am just as fresh during the 2nd match as the first. This means that my mind is able to better concentrate on the "scan". By "scan" I mean my routine between shots to evaluate the shot and make any needed corrections.

That's just my 2 cents worth and I will look forward to seeing how the performance of your 7mm goes.

 

[JohnVanMarter]

ConnorExum
The following case design does what you are considering. Using a 7mm RSAUM case-body shortened by .200,new body length- 1.330) use the 35 deg. shoulder angle and shoulder dia. of the 7WSM and a final case length of 1.800. The case neck length is .400.
The case capacity is 50 gr's. of H4831 to the base of the shoulder. The shoulder cone holds 5 gr's.The throat is set-up to allow the base of a 175 gr. Sierra MK. to be even with the base of the neck.Vel. with the 175 gr. bullet,mollied)in a 31" Broughton 5C barrel,54.5 gr. H4831SC is 2951-Es-10. The 175 Sie. is .010 off the lands. The 180 gr. Berger is .030 into the lands for the same vel., Es-29
I have been using my design now for 4 years and it will shot inside a 6.5-284, 10 mph at 9 by at least .5 MOA and on the "F-Class" target that sure gives you a advantage-points saved when the wind changes.
The case name is the 7mm Stumpy. I also use the same case design but reduced to 6.5 and call it the 6.5 Stumpy. The basic concept in 6.5 is to provide 6.5- 284 vel. without having the unused air space found in 6.5-284 loads. The 7mm duplicates the 284 in a shorter compact case body.
Hope this provides some info that is of some use.
Cheers,
John

How about a 404 Jef cut down to 47mm with no body taper and 40deree shoulder... What sort of powder capacity would that give us? It appears we need about 50grains to get the velocity I want and not 41-42grains.

Sounds like a 7mm Dakoa improved if you ask me. there gets to be a point of diminishing returns, and I think we we are getting close.

SDH

Yeah a 404jeffery cut down 47mm would be similar to 7mm Dakota Mag, the 7mm WSM and even the 7mm Ultra Magnum. However, the Pegasus cartridge would be different breed, I was hoping to get about 60-65grains of capacity a 100% load density for 168grain bullet... I wanted a nice wide short column of powder that hopefully burn more efficiently giving me maximum velocities at 60-62k Psi but who knows if it would. it is all just conjecture and since I'm still in College I really don't have the cash to play around find out.

 

[ConnorExum]

ConnorExum
The following case design does what you are considering. Using a 7mm RSAUM case-body shortened by .200,new body length- 1.330) use the 35 deg. shoulder angle and shoulder dia. of the 7WSM and a final case length of 1.800. The case neck length is .400.
The case capacity is 50 gr's. of H4831 to the base of the shoulder. The shoulder cone holds 5 gr's.The throat is set-up to allow the base of a 175 gr. Sierra MK. to be even with the base of the neck.Vel. with the 175 gr. bullet,mollied)in a 31" Broughton 5C barrel,54.5 gr. H4831SC is 2951-Es-10. The 175 Sie. is .010 off the lands. The 180 gr. Berger is .030 into the lands for the same vel., Es-29
I have been using my design now for 4 years and it will shot inside a 6.5-284, 10 mph at 9 by at least .5 MOA and on the "F-Class" target that sure gives you a advantage-points saved when the wind changes.
The case name is the 7mm Stumpy. I also use the same case design but reduced to 6.5 and call it the 6.5 Stumpy. The basic concept in 6.5 is to provide 6.5- 284 vel. without having the unused air space found in 6.5-284 loads. The 7mm duplicates the 284 in a shorter compact case body.
Hope this provides some info that is of some use.
Cheers,
John

How about a 404 Jef cut down to 47mm with no body taper and 40deree shoulder... What sort of powder capacity would that give us? It appears we need about 50grains to get the velocity I want and not 41-42grains.

Sounds like a 7mm Dakoa improved if you ask me. there gets to be a point of diminishing returns, and I think we we are getting close.

SDH

Yeah a 404jeffery cut down 47mm would be similar to 7mm Dakota Mag, the 7mm WSM and even the 7mm Ultra Magnum. However, the Pegasus cartridge would be different breed, I was hoping to get about 60-65grains of capacity a 100% load density for 168grain bullet... I wanted a nice wide short column of powder that hopefully burn more efficiently giving me maximum velocities at 60-62k Psi but who knows if it would. it is all just conjecture and since I'm still in College I really don't have the cash to play around find out.

Thanks I feel vindicated since it was just a hunch but I had a feeling that 50-60grains is optimal...