How about 180 grains on a 150 grain profile?

I'll test it for ya.

And if you build a 100-110 grain .243 bullet, I will also test it for ya.

Done Deal.

I don't have one of those 20mm cases necked down to 7mm, but I do have a .243. My 7mm's are much more docile.

I am building a new 7mm wildcat right now. 300 WM case, .284 length neck, 30 degree shoulder at .493. Objective is 175 gr @ 3100 fps. I'm trying a Montana Rifleman barrel @26 inches in stainless with 9 1/2 twist. I was going to mount it on a claw extractor Mod 70 action, but I think I am going to go with a Rem Mod 700. Have a great gunsmith- George Vais.

Building it to replace my .338. Doctor says I can't shoot anything with that much recoil any longer because I have a detached vitrious in my right eye. Love to shoot the .338 but after shooting about 30 rounds a couple of weeks ago, I felt like I had a concussion. Doc says strong impact ( or jarring) to the head or face is not a good idea.

Ridge Runner

You might look at the message in response to jeepkid's response. I'm afraid that most of that is pointed at you. As a matter of fact I thought the .243 bullet idea was yours because I really didn't look at the respondant.

We will still get him his 110 gr .243 round.

Sweet! I'm getting a .243 AI built by Kampfeld Custom (eta, next month) with a 1/8 twist Broughton so I'll be able to shoot the long heavy bullets.

What are you doing with the Model 70 action? I need one for a .375 H&H project...

I'm going to hang onto it, but good luck on your .375 project.

I too would like to know exactly how you increase sectional density with out changing either the weight for a given caliber or the caliber for a given weight.

A bullet with "X" diameter and "Y" weight will have "Z" sectional density. You can makea givencaliberbullet as long or as short as you want but the sectional density will remain the same provided the weight remains the same. AmI missing something here???????

If you need a 30 cal testbed for loong or heavies I've a 1-9 twist 06' . It came that way to me I'm told that its good up to 250's looks threaded next to a 1-12 308 .

I am not sure I follow you BC pertaining to SD. SD is based on weight and bullet diameter. ie: .284 160 Barnes MRXor 160 Nolser Partition has a SD of .283! In order to increase the SD in a given caliber youcan only addweight to the above equation.

We do not change the SD of a bullet of a given weight, but we can change the SD of a profile of a given weight, say a 150 gr. bullet. We make a bullet the exact shape of the 150 gr projectile, but we decrease the weight or increase the weight- thus a change in SD.

We will be focusing on increasing the SD of a given profile. By example if you currently shoot a 168 gr. Sierra Matchking in your 7mm Rem Mag, and we increase the weight of the bullet to 195 gr but maintain the profile we have changed the SD. What we have done is increase the SD from .298 to .343 in rough numbers.

With the minimized surface area of the heavy bullet we have not only increased the SD of the bullet but also substantially increased the BC of the bullet as well. This is the basis of our hypothesis.