I must have got lucky - a Lot- Ive bedded several rifles -with devcon & I just put a gob of black down - add a little white - kinda 70-30 mix by estimation & its allways set up so hard my thumbnail wont leave a mark in it & the rifles all shot well - I do seem to run out of both black & white at same time - or nearly so it must be kinda close- anyway it works for me -