Search found 231 matches

by Frank Green
Thu Jan 17, 2019 1:01 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Peter, twist rate calc on the 147's and 150's. 147's @ 2600fps. I get a min. of 1-7.656 twist. @ 2800fps. I get a min. of 1-7.92 to 1-8.052 twist depending on the numbers I use. So I say 8 twist is ragged edge for the 147's. 150SMK @ 2600fps. I get a min. of 1-7.392 twist. @ 2800fps. I get a min. of...
by Frank Green
Wed Jan 16, 2019 2:13 pm
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Peter, I can do a twist rate check again tomorrow on the 147’s for you. I know they will fly in a 1-8 but I feel the 1-8 is on the edge. I asked one of the ballistic guys at Hornady what he recommended on them. He said same thing they will fly in a 1-8 but he was more comfortable with a 1-7.5 twist....
by Frank Green
Tue Jan 15, 2019 8:48 pm
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Frank, Peter and Williada - Thank you very much for your data and information I've landed at leade angle not being a significant contributor but an influencer to some extent on precision. Its interesting but most I have spoken to with the new 200s and fast twists that couldn't get them shooting to ...
by Frank Green
Tue Jan 15, 2019 8:43 pm
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

All very interesting to say the least. Not to get off subject about throat angle. I’ve shot a lot of the Hornady bullets both in handloaded form and in box ammo form. I haven’t expierenced and bullet failures/tip melting etc...I know it’s been talked about over here as well. I also know before Horna...
by Frank Green
Tue Jan 15, 2019 5:38 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Sorry I'm not allowed to say who did the testing and or give more details. The one page I can say it is a .308win and a 175smk. The other page is a .30cal. mag but again I cannot say the bullet. I don't want this to come across as bashing makers etc....Look at the bottom right of each graph sheet. I...
by Frank Green
Tue Jan 15, 2019 1:57 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

I just attached the drawings to my previous post.
by Frank Green
Mon Jan 14, 2019 2:43 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Thinking about it some more I can give an example or two of crooked chambers or what I will call chambers that where cut off center line of the bore. Bill at work back around 2006 we rebarreled his factory Rem. Varmint in .223 Rem. No matter what he did he could never get the gun to shoot. Pillar be...
by Frank Green
Sun Jan 13, 2019 12:37 pm
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Bullets themselves I believe can be a problem. O.K. I’ll come out and say it....some are a problem. A couple of things to think about....the balance point of the bullet and the design of the bullet. I’m not a bullet maker! I’ll base what I say from test data that I have seen and customer problems th...
by Frank Green
Sun Jan 13, 2019 2:14 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Could a 5R give less resistance to and damage a projectile less on entering the lands ? Peter Smith.[/quote] Peter, I do believe in the 5R (or even a conventional 5 groove barrel) the lands don't directly oppose one another. So to me this helps distort/upset the bullet jacket less. In conjunction wi...
by Frank Green
Sat Jan 12, 2019 3:33 pm
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Peter makes some more good points. When testing my new F class gun mid summer of 2018 in .300PRC. I started loading another batch of ammo with the 225 Hornady’s. By mistake on my part when I adjusted the seating stem down further I actually seated the bullets .050” off the lands. I didn’t pull the b...
by Frank Green
Sat Jan 12, 2019 3:24 pm
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

strangely berger vld bullets are generally shot jammed by target shooters who chase the rifling religiously. however when used in hunting rifles they seem to work well enough with massive jump. but not in between. bruce. I don’t agree with this. I for the most part would only shoot the VLD’s when I...
by Frank Green
Sat Jan 12, 2019 10:56 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

To kinda add to post #7 of mine....back when we started Bartlein Barrels and being on our own and gone from Krieger. I made a sample barrel for a really good customer of mine. His customer keeps excellent data and shoots hi power rifle across the course. If I recall correctly in his .223 gas gun in ...
by Frank Green
Sat Jan 12, 2019 10:47 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

We all know that a crooked chamber per say vs. a straight chamber effects how the bullet makes the jump into the barrel. The more the bullet starts out of true centerline to the bore...that any runout the bullet/ammo has it basically has a premature wobble to it. The more the bullet starts crooked i...
by Frank Green
Sat Jan 12, 2019 10:26 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Hard for me to prove it but I do feel that changing from one type of bullet to another type of bullet in the same gun that after x amount of rounds being fired to some what of an extent the throat will change and modify it’s self to some extent to a given bullet. Again hard for me to prove. I also d...
by Frank Green
Sat Jan 12, 2019 10:20 am
Forum: Equipment & Technical
Topic: throat angle
Replies: 46
Views: 956

Re: throat angle

Bruce, I wouldn’t necessarily agree the 1.5 degree angle is used as a default. I would agree that it seems to be a given over the years that for best accuracy in a target type gun it’s what is needed. That being said I’ve shot plenty of guns chambered with a 2 degree 30 minute angle throat, 3 degree...

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