Hammer Bullets shoulder design

RockyMtnMT

RockyMtnMT

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We recently had a customer with a tight match chamber in a .264 caliber custom rifle. His tight match chamber is particularly tight and would not allow the shoulder of the 124g Hammer Hunter to enter the free bore, requiring a long jump to the lands and seating too much bullet in the case. As most of you know we cut our bullets to be .0005" over caliber. This is what our patented PDR design allows in order to seal the bore of loose barrels without creating over pressure in tight bores. Works perfectly as designed. What we did to fix this tight chamber problem was to redesign the bullet with the shoulder at caliber and taper the baring surface to the boat tail junction to the .0005" over caliber. This solved the chambering problem and allowed the bullet to be seated out properly.


I am not sure that we will ever run into another chamber this tight again, but the other benefit of doing this with our tangent ogive, is it will allow longer seating before touching the lands. Not sure if it will be noticeable, but technically it will reduce the initial engraving pressure slightly.


We are considering doing this to the entire line of bullets. Question to you all is, do you think this is a worthwhile endeavor? It will take Brian about an hour per program to make the changes, so not a small project. I don't think it will change anybody's existing loads, but I do think it will be a benefit for case capacity for future loading. Other than Brian's time to do this I think it is all positive. Give me your thoughts.

Read more: http://hammerbullets.boards.net/thread/624/shoulder-design-on-hammer-bullets#ixzz5rI4V0h00
 
I say leave them alone....lots of guys already have proven loads, IF it does change their loads then everyone MIGHT have to rework their loads.
If you do decide to change them I feel you should test, test, and do more testing to make sure it wont change anything about people's existing loads.

Guys with tight match chambers dont seem to be the norm and should expect to have to deal with "special" situations.

Now maybe this would be a good idea for your future "match" bullets as more people with "match" chambers might be the norm for those bullets, but I say leave the hunting series alone unless it can be proven without a doubt that it would not change proven loads.

Just my opinion
 
Steve, I am interested in what that will do in a .0005 over cal. freebore . I have two chambers that are tight in the FB but they shoot very small groups, and are not finiky to what bullet they shoot or the jump you giove them, everything you load for them they go right to .5 moa and real easy to get .250 moa with tuning, their FB's are to caliber, but I have multiple chambers that are .0005 over. I wonder if the tapered shoulder would still perform in the over cal FB chambers
 
RockyMtnMT said:
We recently had a customer with a tight match chamber in a .264 caliber custom rifle. His tight match chamber is particularly tight and would not allow the shoulder of the 124g Hammer Hunter to enter the free bore, requiring a long jump to the lands and seating too much bullet in the case. As most of you know we cut our bullets to be .0005" over caliber. This is what our patented PDR design allows in order to seal the bore of loose barrels without creating over pressure in tight bores. Works perfectly as designed. What we did to fix this tight chamber problem was to redesign the bullet with the shoulder at caliber and taper the baring surface to the boat tail junction to the .0005" over caliber. This solved the chambering problem and allowed the bullet to be seated out properly.


I am not sure that we will ever run into another chamber this tight again, but the other benefit of doing this with our tangent ogive, is it will allow longer seating before touching the lands. Not sure if it will be noticeable, but technically it will reduce the initial engraving pressure slightly.


We are considering doing this to the entire line of bullets. Question to you all is, do you think this is a worthwhile endeavor? It will take Brian about an hour per program to make the changes, so not a small project. I don't think it will change anybody's existing loads, but I do think it will be a benefit for case capacity for future loading. Other than Brian's time to do this I think it is all positive. Give me your thoughts.

Read more: http://hammerbullets.boards.net/thread/624/shoulder-design-on-hammer-bullets#ixzz5rI4V0h00
Click to expand...

Steve , I understand why folks with proven loads don't want to change, but I would be happy to try the new design in the 143g/.284 Hunters.
-Mike
 
There may be something else going on here. A couple of the guns I've shot the various Hammers in have freebore dimensions which are only .0005" over bore diameter and I haven't had an issue yet. Of course I'm working off the assumption that the chambers actually match the reamer and that the reamer actually matches the print.

Maybe integrate the new design into all future models, but leave the current versions alone.
 
Have you all found them to copper foul a barrel faster than cup/core bullets? I was told by a fellow shooter who has used em, to strip my barrel of copper every 50 rounds or irregular pressure will be observed by round 70-80. He experienced non if that same issue with traditional rounds. The barrel was not known to copper quickly before switching to hammers. Rifle was quite accurate with both bullet types.
 
highdrum said:
Have you all found them to copper foul a barrel faster than cup/core bullets? I was told by a fellow shooter who has used em, to strip my barrel of copper every 50 rounds or irregular pressure will be observed by round 70-80. He experienced non if that same issue with traditional rounds. The barrel was not known to copper quickly before switching to hammers. Rifle was quite accurate with both bullet types.
Click to expand...

I haven't experienced that in any of my guns with the Hammers. You will have trouble if you alternate between any of the solid copper bullets and standard jacketed bullets. The same thing happens with Barnes and Cutting Edge bullets too.
 
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