RockyMtnMT
Official LRH Sponsor
http://www.longrangehunting.com/forums/attachment.php?attachmentid=58760&stc=1&d=1457618028
Let's see if this works.
Steve
Let's see if this works.
Steve
Hammer Bullets Pic
- Thread starter RockyMtnMT
- Start date
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RockyMtnMT
Official LRH Sponsor
From left to right.
.243 80g
.257 93g
.264 125g
.277 117g
.284 133g
.308 153g
.308 167g
.308 183g
.308 215g
.338 261g
With the exception of the .308 215g, these are all designed for standard twist for caliber.
Steve
adam32
Well-Known Member
Looks good...I'll take some 80gr 243 bullets when you're ready.
RockyMtnMT
Official LRH Sponsor
I am soooo ready. We had to change copper alloy because low vel impacts were not good enough. Did preliminary testing last week and all looked good, particularly with the heavier bullets. Will be doing some more tests tomorrow. Many manufactures don't specify a velocity floor for their bullets. But coming from a long range background we feel it necessary to know for sure by testing what min vel for hunting is for each of our bullets, and pass that on to our customers. We also are waiting for a load of our new copper alloy to arrive. The .243 is one in particular that we will be testing tomorrow to have an accurate min vel so that you will know your max range that it will perform.
Steve
RockyMtnMT
Official LRH Sponsor
I'll do that tomorrow. I get involved in what I am doing and always forget to take pics. Do the same thing when hunting. Gotta get better.
Steve
MudRunner2005
Well-Known Member
You know, if you slimmed that .264 125gr bullet down to a .257"...That would be one nasty bullet for the fast .25 shooters, like myself. Wonder what twist it would require to spin it?
adam32
Well-Known Member
With how much alike they seem compared to GS Custom bullets I would imagine low vel impacts will be about the same, they say around 1800 fps on their bullets. I'm curious what you'll find with yours.
RockyMtnMT
Official LRH Sponsor
If we duplicate the 6.5 and just shrink the dia it would be 1.39" long and weigh 115g (est). Launched at 3000fps at sea level, the min recommended twist would be 7.25". We have one that we have been working on that is designed for a 7" twist and comes in closer to 120g.
Steve
RockyMtnMT
Official LRH Sponsor
Similar in the fact that they are mono metal. Design is quite a bit different. The drive band design is significantly improved. Which is how we got a patent.
We are determined to catch our bullets at vel to verify function. We made some assumptions in the past, and thankfully found out we were wrong before we marketed. We will no longer assume anything. If we do estimate a statistic on a bullet we will make it known that that statistic is an estimate. There is only one way to not get in trouble with customers. Stay honest and open.
Steve
RockyMtnMT
Official LRH Sponsor
Here is some more information regarding twist. We have done all of our twist rate calculations at sea level and 59 deg F. The original post showing our initial line of bullets are calculated based on the prevailing twist offered by manufactures factory rifles. We have done quite a bit of work on faster than normal twist in many calibers and will definitely continue to. Working on the frontier of shooting is very exciting.
caliber weight length recommended twist
_____________________________________________
.243 80g 1.035" 1-9"
.257 93g 1.069" 1-10"
.264 125g 1.393" 1-8"
.277 117g 1.213" 1-10"
.284 133g 1.293" 1-10"
.308 153g 1.244" 1-12"
.308 167g 1.393" 1-12"
.308 183g 1.524" 1-10"
.308 215g 1.752" 1-9"
.338 261g 1.793" 1-10"
Steve
caliber weight length recommended twist
_____________________________________________
.243 80g 1.035" 1-9"
.257 93g 1.069" 1-10"
.264 125g 1.393" 1-8"
.277 117g 1.213" 1-10"
.284 133g 1.293" 1-10"
.308 153g 1.244" 1-12"
.308 167g 1.393" 1-12"
.308 183g 1.524" 1-10"
.308 215g 1.752" 1-9"
.338 261g 1.793" 1-10"
Steve
MudRunner2005
Well-Known Member
Would there be any way to shorten the bearing surface, stretch the boat tail, but elongate the tip more VLD Hybrid style, and get to around 125-130gr, that would work closer to a normal (10" twist). I'm sure it wouldn't work in a 10" twist, but would there be a way to get it closer? Just thinking out loud...
RockyMtnMT
Official LRH Sponsor
Yep, twist required is a function of length and weight. Mostly length. A shorter bearing surface with the same length would actually need more twist because it would lose weight. So it goes that the smaller bores need faster twist rates relatively to the bigger bores. The 6.5mm calibers in production are the only caliber that is up to date with how fast a twist should be. The market will come along, I hope.
Steve
Steve
