Lapua sell 338 once fired? Updated bushing question
- Thread starter warrenb
- Start date
I have had the best results so far with the retumbo 87.5 grains in the Timberwolf I suspect they are around 2700-2740 FPS with the 300 grain Scenars my chrony died the last time I went out and have had no time to fix it.
If I load up to what other .338 LM rifles take for powder my velocities are quite a bit quicker a pressure signs are there. For example I get 2640 FPS with 85 grains H-1000 under 300 gr Lapua scenars I will have to try Vit 570!
If I load up to what other .338 LM rifles take for powder my velocities are quite a bit quicker a pressure signs are there. For example I get 2640 FPS with 85 grains H-1000 under 300 gr Lapua scenars I will have to try Vit 570!
- Location
- calgary alberta
I have had the best results so far with the retumbo 87.5 grains in the Timberwolf I suspect they are around 2700-2740 FPS with the 300 grain Scenars my chrony died the last time I went out and have had no time to fix it.
It is funny how each rifle even in the same caliber can either "like" or "dislike" a given powder. I have not had any good results using Retumbo in 338 Lapua, yet obviously it is working well for you. Strange huh?
It is nice to see some actual velocities posted with the 300 gr bullets being shot from standard 338 Lapua. We hear all about how guys are getting 2900 FPS from this cartridge, but I always wonder how many really own a chronograph. Everyone who I believe actually has 1 is claiming low 2700s and under for velocity.
Have you got a come up for 1000 yards? as near as I can figure you should need about 25 to 27 MOA over 100 yard zero, but have not spent much time behind a SAAMI or CIP spec 338 Lapua.
The 338 LAI I shoot sends 300 gr SMKs out the barrel at 3050 to 3065 FPS depending on environmental differences and I need 19.5 MOA over 100 yard zero to make 1000 yard hits on the gongs.
I ask simply out of curiosity.
I think the guys claiming some of the higher velocities are shooting pretty hot! I have been as high as 2930 FPS but had pressure signs and would not want to subject my brass and rifle to this kind of abuse and of course my own safety. With the 250 grain Scenars I get 2865-2930 depending on brass prep and conditions. I find brass prep really important in relation to velocity spread especially concentricity as this effects the bullets foot print in the barrel! I like to keep the loaded rounds under .002" and group them accordingly as I get as good as .001" and a smidge under this of course when I am feeling anal enough and have the time to ### out.
My come up at 1000 is 23 MOA to 26 MOA depending on conditions! In Southern Ontario we can get some wicked humidity and with water vapour being less dense then air and your ammo box and rifle roasting in the sun all day in a feild like say Base Borden velocities go up! I really need to put my chrony up when shooting in these type of conditions so I can see how much velocity changes! Its just so danm hot though you really dont feel like moving too much.
Just in case anyone doubts that water vapour is less dense then air here is why and a good explanation. Allot of people do not believe me so I direct them to this link! http://www.engineeringtoolbox.com/density-air-d_680.html
I like the sounds of the LAI this will be considered for sure on the next rebarrel! I think I might get my next barrel nitraded (sp?) I have a guy in Southern, Ontario who is very very experienced at this process although not with gun barrels but allot of other exotic applications with extreme operating environments.
I have been told about 2500 rounds if you do your part! The AI barrels claim double this they are probably nitraded (sp?) or some other process to resist wear and throat erosion. I am still on my first barrel about 1300 rounds so far.
