mr hollowpoint vs nsa speeds

[sticman77]

do the design of the mr hollowpoint slugs generate higher velocities, due to less friction on the slug overall? it makes sense in theory, but unsure if it actually makes much difference.

i could of course order some slugs from each and test this out, but it's cheaper to see if anybody else has gone through this exercise

Mr Hollowpoint:

NSA:

 

[bandg]

I would say probably yes as the NSA slugs do seem to drag quite a lot more and produce slightly lower velocity than do slightly heavier pellets, at least in my shooting. As to the Mr. Hollowpoint slugs, why not eliminate the middle 3 "bands" and have even less drag? The front shoulder and rear band would seem to be enough to stabilize the slug in the bore.

 

[jwrabbit123]

the drag would be less with the slug with bands , But by looking at slugs if they were close to identical weights , the NSA would fly flatter and have a higher bc due to being more aerodynamic

LOU

 

[MrP]

The nsa slugs also come out with low energy for their weight in my airforce guns. No surprise really... drive band slugs for me are generally more efficient. 

 

[sticman77]

bandg - thats a good point. they remind me of the h&n snipers... which i never got great accuracy with. although i attribute that more to the super thin skirts that were almost always damaged

jw - that makes sense. the mr hollowpoint design is almost like a funky pellet, although i did choose the most extreme example. other slugs, the ribs, and spaces are flipped, thin spacing

mr p - i've noticed that as well. i think the choke on the lw barrels is probably not helping much.



thanks for the thoughts/confirmations. i think i'm going to sample some midweight NSA for longer range, and mr hollowpoint for heavier closer smack down power.

 

[bandg]

the drag would be less with the slug with bands , But by looking at slugs if they were close to identical weights , the NSA would fly flatter and have a higher bc due to being more aerodynamic

LOU

How would the drag be LESS with the slug WITH BANDS? 3 fewer bands should result in less physical contact with the barrel and thus less drag, not more.

 

[Guest]

the drag would be less with the slug with bands , But by looking at slugs if they were close to identical weights , the NSA would fly flatter and have a higher bc due to being more aerodynamic

LOU

How would the drag be LESS with the slug WITH BANDS? 3 fewer bands should result in less physical contact with the barrel and thus less drag, not more.

I dont think he replied to you eventho your idea of removing those 3 bands would cause too little bearing area to properly stabilize that bullet. 

 

[bandg]

Unless I'm badly mistaken, he replied DIRECTLY to me. And I'll ask again, how could the projectile have less drag in the barrel with all the bands than it would with 3 fewer? As to the second part of your view, it is simply an opinion and although it is possibly accurate, I don't agree with it.

 

[Singleshot]

I think he comparing the projectile with all the bands with nsa slugs, not with 3 fewer bands you mention. So I agree with him that nsa slugs will have more drag in the barrel compare projectile with bands. But once nsa slugs leave the barrel it will have higher BC than projectile with bands, thus have more flatter trajectory...IMHO.

 

[bandg]

I think he comparing the projectile with all the bands with nsa slugs, not with 3 fewer bands you mention. So I agree with him that nsa slugs will have more drag in the barrel compare projectile with bands. But once nsa slugs leave the barrel it will have higher BC than projectile with bands, thus have more flatter trajectory...IMHO.

I believe you are correct. My view was that the Mr.H bullets should shoot with less drag without the 3 center bands as compared to one with all bands and could work very well that way, but I believe most would agree that the unbanded NSA slug would have higher drag than either the stock Mr.H bullet or one with the 3 center bands removed. I've noticed higher drag (lower velocity) from 12.5 NSA slugs than from JSB monsters over 13 grains in multiple guns. That could only be caused by 1 of 2 things-loss of sealing from the NSA slug or higher drag from the NSA slug. My belief is that it is probably the second although the first is not out of the question.

Then another poster stated unequivocally that removing the 3 center bands from the Mr.H bullet would cause loss of stability of the Mr.H bullet. That might be true but might not be and is simply an opinion stated as fact.

 

[Guest]

Actually fact or not but you are heavily overestimating friction effect. Removing those 3bands on bullet with already abnormally thin driving bands would gain nothing or very little actually biggest effect would mostlikely come from reduced mass instead of friction and even both combined I highly doubt you would even see 1ft/s difference where as its really likely you would start to have alot stability problems due no proper rifling engagement. Yes that MR hp bullet should have less friction than NSA and yes 3bands removed should have least but benefit of reduced friction is next to nothing.

 

[bandg]

Actually fact or not but you are heavily underestimating friction effect. Removing those 3bands on bullet with already abnormally thin driving bands would gain nothing or very little actually biggest effect would mostlikely come from reduced mass instead of friction and even both combined I highly doubt you would even see 1ft/s difference where as its really likely you would start to have alot stability problems due no proper rifling engagement. Yes that MR hp bullet should have less friction than NSA and yes 3bands removed should have least but benefit of reduced friction is next to nothing.

Once again, opinion. Possibly valid and possibly not, but still only opinion.