Need help with new 300 ultra mag
 

I just bought a 300 ultra mag and I reload my own ammo. I would like some advice for some proven loads to start with. I am going to be shooting 180's out of it, only I don't know what bullets I am going use. I have shot seirra all my life in my other rifle's, but would like to try something differant with this new gun. I will be hunting black bear in Pa. and elk out west. I would be greatful for opinions on bullets and loads. Thanks, Tim

RE: Need help with new 300 ultra mag
 

I would try reloader 25 powder and bullets such as the accubond,partition or tsx if they shoot well in your rifle.

RE: Need help with new 300 ultra mag
 

I shoot 180 gr Nosler Accubonds with 93 gr of H1000, seat bullet to just clear your magazine, should be in the 3.59-3.61 range. I got most of my info from Bigcountry or Stubblejumper, they are the guys on here to listen to. If I can be any help pm me Id be glad to help you out. One note, higher velocities in these guns (3500-3600) have been known to reduce barrel/throat life, I try to keep mine in the 3200-3400 range.

RE: Need help with new 300 ultra mag
 

Try the 180 gr. Swift Scirocco - great all around load at about 3300 fps.

RE: Need help with new 300 ultra mag
 

Hey RR thanks for the info, but could you tell me how many grains of that powder. I can't find that info. Thanks Tim

RE: Need help with new 300 ultra mag
 

Try www.accuratepowder.com.

RE: Need help with new 300 ultra mag
 

My Uncle is currently using 180gr Hornady Interbonds with his Ultra Mag.
Although (I think) all he has done is punched holes in paper so far,
he is very impressed with the overall accuracy from 100yrds outword towards 500yrds.He also says there is 100 bullets/box and the the price of them is lower compared to similar makes in different brands.

RE: Need help with new 300 ultra mag
 

I am curious as to your reasoning for this statement.Have you actually tested identical, barrels cut with identical reamers shooting the same bullets at the same velocities with several powders until the accuracy began to deteriorate,in order to determine if the powder used makes a significant difference?

RE: Need help with new 300 ultra mag
 

I think this is one thing alot of people dont realize....reamers do wear out, slowly, so a barrel made #1 will be slightly different than barrel #47 and then they may change reamers at barrel #75 and then #76 will be cut from a new one. Good point stubble

RE: Need help with new 300 ultra mag
 

Actually my point was that different reamers are made with different throat lengths which can have a great effect on throat erosion and therefore accurate barrel life.